Herbicide

ABSTRACT

1. A HERBICIDE CONSISTING ESSENTIALLY OF A HERBICIDALLY EFFECTIVE AMOUNT OF A MIXTURE OF (A) A COMPOUND HAVING THE FORMULA 2,2,4-TRI(O=),3-R-3,4-DIHYDRO-1H-2,1,3-BENZOTHIADIAZINE R DENOTING AN ISOPROPYL, ETHYL OR METHYL RADICAL OR A SALT THEREOF, AND (B) A COMPOUND HAVING THE FORMULA (CH3-N(-CH3)-CO-NH-)PERHYDRO-4,7-METHANOINDENE AND (C) A COMPOUND HAVING THE FORMULA 1-PHENYL,4-(H2N-),5-(BR-),6-(O=)-6,1-DIHYDROPYRIDAZINE IN A WEIGHT RATIO OF A:B AND A:C OF 4:1 TO 1:3 SAID MIXTURE BEING DISPERSED IN A CARRIER.

United States Patent Office 3,846,113 Patented Nov. 5, 1974 US. Cl. 71-91 6 Claims ABSTRACT OF THE DISCLOSURE Herbicides containing a substituted benzothiadiazinone dioxide, N-[lor 2-(3a,4,5,6,7,7a-hexahydro-4,7-methanoindanyl)]-N',N'-dimethylurea and 1-phenyl-4-amino- -bromopyridazone-(6) as an additional active ingredient,

and a process for controlling the growth of unwanted plants with these mixtures.

DETAILED APPLICATION This application is a division of my copending application Ser. No. 18,713, filed Mar. 11, 1970.

The invention relates to a herbicide containing a substituted benzothiadiazinone dioxide and at least one other active ingredient.

It is known to use I. 3-isopropyl-2, 1 ,3-benzothiadiazinone- (4) -2,2-dioxide;

II. 1-(a,tx-dimethyl-fl-acetoxypropionyl) -3isopropyl 2,4-

dioxodecahydroquinazoline;

III. N-[lor 2-(3a,4,5,6,7,7a-hexahydro-4,7-methanoindanyl)]-N',N-dimethylurea; and

IV. 1-phenyl-4-amino-S-bromopyridazone-(6) for controlling the growth of unwanted plants; however, their action is not satisfactory.

We have now found that mixtures comprising (a) a compound having the formula R denoting an isopropyl, ethyl or methyl radical or their salts (potassium, sodium or ammonium salts), and (b) the compound having the formula /CH3 NHC O-N H Hm/ CH H2 I CH2 Ho) H2 I H H(2) and (c) the compound having the formula NHz have a better herbicidal, particularly selective herbicidal, action than the individual active ingredients.

The particular advantage of these mixtures is that they have an excellent action on most dicotyledonous and monocotyledonous weeds and favorable selectivity on important crop plants, e.g., rice, Indian corn, barley, wheat and rye.

The ratio of components, a, b and c in the mixtures may be varied at will; those mixtures of the active ingredients are preferred which have the respective weight ratio a:b and azc of 4:1 to 1:3.

The 3-isopropyl (or ethyl or methyl) 2,1,3-benzothiadiazinone-(4)-2,2-dioxides and their salts (compound a) are known compounds, whose preparations are described in Ziedler et al. U.S. Pat. No. 3,708,277.

The N-[lor 2-(3a,4,5,6,7,7a-hexahydro-4,7-methanoindanyl)]-N,N'-dimethylurea (compound b) and its preparation are disclosed in German Pat. No. 1,200,062, granted Sept. 2, 1965.

The 1-phenyl-4-arnino5-bromopyridazone-(6) is described in a publication of a manuscript of A. Fischer by I.I.R.B., vol. 3-no. 3-1968, as a reprint from the Journal Extrair de la Revue, Edit: 150, Beauduinstraat, Tirlemont, Belgium.

The herbicides according to this invention may be used as solutions, emulsions, suspensions or dusts. The form of application depends entirely on the purpose for which the agents are being used; in any case it should ensure a fine distribution of the active ingredient.

For the preparation of solutions to be sprayed direct, the solution in water is suitable. However, hydrocarbons having boiling points higher than C., e.g. tetrahydronaphthalene or alkylated naphthalenes, or organic liquids having boiling points higher than 150 C. and one or more than one functional group, e.g. the keto group, ether group, ester group or amide group, this group or these groups being attached as substituents to a hydrocarbon chain or being a component of a heterocyclic ring, may also be used as spray liquids.

Aqueous formulations may be prepared from emulsion concentrates, pastes or wettable powders by adding water. To prepare emulsions the ingredients as such or dissolved in a solvent may be homogenized in water or organic solvents by means of wetting or dispersing agents, e.g. polyethylene oxide adducts. Concentrates which are suitable for dilution with water may be prepared from active ingredients, emulsifying or dispersing agent and possibly solvent.

Dusts may be prepared by mixing or grinding the active ingredients with a solid carrier, e.g. diatomaceous earth, talc, clay or fertilizers.

The mixtures may be used as such, or in admixture with insecticides, fungicides and fertilizers.

The following experiments demonstrate the application of the agents according to the invention.

EXAMPLE 1 On an agricultural site the plants barley (Hordeum vulgare), wheat T riticumvulgare), rye (Secale cereale), annual bluegrass (Poa annua), ladys thumb (Polygonum persicaria), catchweed bedstraw (Galium aparine), slender foxtail (Alopercurus myosuroides) and wild oats (Avena fatua) are treated at a growth height of 3 to 20 cm. with 1.5 kg. per hectare of 3-isopropyl-2,1,3-benzothiadiazinone-(4)-2,2-dioxide (I), with 0.75 kg. per hectare of N- [1- or 2-(3a,4,5,6,7,7a-hexahydro-4,7-methanoindanyl)]- N,N-dimethylurea (III), with 0.75 kg. per hectare of 1- phenyl-4-amino-S-bromopyridazone-(6) (IV), and with a mixture consisting of 1.5 kg. per hectare of I+0.75 kg. hectare of III+0.75 kg. per hectare of IV, all these amounts of the active ingredients each being dispersed in 500 liters of water per hectare. After 4 weeks, the action of the active ingredients and the mixture on the crop plants and broadleaved and grassy weeds is ascertained by determining their fresh weight (mean figures taken as relative values compared with untreated plants (=100)). It is ascertained that the fresh weight of cereals from the treated plots, and particularly in the case of the mixture of I+III+IV, is in some instances somewhat higher than in the case of the untreated plots, and the weight of the broadleaved and grassy weeds, in contrast to the un treated plots, decreases to such a great extent that only a few grams can be ascertained.

The results of the experiment are given in the following table:

4 (b) a compound having the formula H CH3 /l\ H1 NH-CO-N l CH; Hz CH3 H2\'/ H2 and (c) a compound having the formula Fresh weight (relative) Poly- Alope- Triligonum cums Active Application Hordeum cum Secul Poa per- Galium myo- Avena ingredient rate vulgare vulgare cereale annua siclzria aparine suroides jatua Untreated 100 100 100 100 100 100 100 100 I 1.5 101.2 105 100 75.4 5.4 40 89.5 95

0.75 98.5 100 95.5 25 .4 1v 0. 75 100 107.5 100 30.5 14.7 60 36.5 89.5 I+III+IV-.-- 1. 5+0. 75+0. 75 101.0 100 102.2 12.1 2.5 24.4 14.7 10

EXAMPLE 2 NHI In a greenhouse, the plants large crabgrass (Digitaria 25 sanguinalis), barnyard grass (Echinochloa crus-galli), p green foxtail (Setaria viridis), yellow nutsedge (Cyperus N esculentus), Bermuda grass (Cynodon dactylon) and red- \N 0 root pigweed (Amaranthus retroflexus) are treated at a growth height of 3 to 20 cm. with 1.5 kg. per hectare of 3- isopropyl-2,1,3-benzothiadiazinone-(4)-2,2 dioxide (1), with 0.75 kg. per hectare of N-[lor 2-(3a,4,5,6,7,7a-hexahydro-4,7-methanoindanyl)]-N,N' dimethylurea (III), with 0.75 kg. per hectare of 1-phenyl-4-amino-S-brornopyridazone-(6) (IV), and with a mixture consisting of 1.5 kg. per hectare of I+0.75 kg. per hectare of ll1+0.75 kg. per hectare of IV, all these amounts of active ingredients each being dispersed in 500 liters of water per hectare. After 4 weeks, the action of the active ingredients and the mixture on the plants is ascertained by determining their fresh weight (mean figures taken as relative values compared with untreated plants (=100)). It is ascertained that the mixture of I+III+IV has, in comparison to the individual active ingredients, reduced the weight of the plants to a very considerable extent.

The results of the experiment are given in the following table:

Fresh Weight (relative) I claim:

dally effective amount of a mixture consisting essentially 1. A herbicide consisting essentially of a herbicidally 0 of effective amount of a mixture of (a) a compound having the formula R denoting an isopropyl, ethyl or methyl radical or a salt thereof, and

(a) a compound having the formula R denoting an isopropyl, ethyl or methyl radical or a salt thereof,

(b) a compound having the formula H H2 NH-C0N H7 CH3 CH2 H2 and (c) a compound having the formula in a weight ratio of azb and azc of 4:1 to 1:3.

References Cited UNITED STATES PATENTS 3,708,277 1/1973 Zeidler et a1. 71-91 3,385,690 5/1968 Luckenbaugh 711 19 X 3,304,167 2/1967 Buntin et a1. 71-119 3,210,353 10/1965 Reicheneder et a1. 260-250 LEWIS GOTIS, Primary Examiner C. L. MILLS, Assistant Examiner US. Cl. X.R. 7l92, 119 

1. A HERBICIDE CONSISTING ESSENTIALLY OF A HERBICIDALLY EFFECTIVE AMOUNT OF A MIXTURE OF (A) A COMPOUND HAVING THE FORMULA 2,2,4-TRI(O=),3-R-3,4-DIHYDRO-1H-2,1,3-BENZOTHIADIAZINE R DENOTING AN ISOPROPYL, ETHYL OR METHYL RADICAL OR A SALT THEREOF, AND (B) A COMPOUND HAVING THE FORMULA (CH3-N(-CH3)-CO-NH-)PERHYDRO-4,7-METHANOINDENE AND (C) A COMPOUND HAVING THE FORMULA 1-PHENYL,4-(H2N-),5-(BR-),6-(O=)-6,1-DIHYDROPYRIDAZINE IN A WEIGHT RATIO OF A:B AND A:C OF 4:1 TO 1:3 SAID MIXTURE BEING DISPERSED IN A CARRIER. 